Inmunoterapia tópica en el tratamiento de la alopecia areata / Topical immunotherapy in alopecia areata treatment

La alopécia areata (AA) es una patología realtivamente frecuente del folículo piloso. Su etiología, si bien es desconocida, probablemente corresponda a un fenómeno autoinmune, aunque factores genéticos y ambientales también estarían involucrados. La inmunoterapia tópica es la modalidad terapéutica más efectiva y aceptada en el tratamiento de la AA crónica severa. La inmunoterapia tópica se define como la inducción y posterior provocación periódica de una dermatitis de contacto alérgica, a través de la aplicación de un potente alergeno de contacto en una zona cutánea determinada. Han sido utilizados tres alergenos de contacto en el tratamiento de la alopecia areata: dinitroclorobenceno (DNCB), dibutil éster del ácido escuárico (SADBE) y difenciprona (DPC). En el presente trabajo se describen las principales características de estos agentes tópicos

Effect of thyroid hormones on delayed type hypersensitivity reaction.

The effect of long term administration of thyroid hormones and its deprivation on delayed type hypersensitivity (DTH) reaction to 2-4 dinitrochlorobenzene (DNCB) was studied. Animals were either pre-treated with thyroid hormones (T3 or T4) for 15 days and then subjected to DNCB skin test or the animals received thyroid hormones and simultaneously subjected to DNCB skin test. In both the cases DTH reaction was found to be increased significantly. When DNCB skin test was performed in the thyroidectomized animals, DNCB skin reaction was significantly decreased and the reaction was restored to normal following supplementation of thyroid hormones to the thyroidectomized animals. TLC and ALC were increased significantly following hormone treatment and thyroidectomized animals. TLC hand, induced significant depression in the count which was restored by hormone administration to the thyroidectomized animals.